Income Taxes - Schedule of Components of Provision for Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 36	$ 37	$ 62
State	5	9	15
Foreign	3	8	8
Total current	44	54	85
Deferred:
Federal	(98)	3	17
State	(23)	1	4
Foreign	(2)	(1)	(1)
Total deferred	(123)	3	20
Total provision for income taxes	$ (79)	$ 57	$ 105